Breathing tube assemblies with adjustable elbow

ABSTRACT

Breathing tube assemblies for use with a respiratory therapy device, such as a continuous positive airway pressure (CPAP) device, includes an elbow that permits adjustment of a position of the breathing tube assembly relative to the respiratory therapy device. In some arrangements, the breathing tube assembly includes a breathing tube and a swivel elbow. The breathing tube is rotationally fixed relative to the respiratory therapy device and the swivel elbow rotatable relative to the breathing tube. In other arrangements, the breathing tube assembly includes an elbow that can be coupled to the respiratory therapy device in one of several possible positions.

INCORPORATION BY REFERENCE TO ANY PRIORITY APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.14/420,241, filed Feb. 6, 2015, and titled “BREATHING TUBE ASSEMBLIESWITH ADJUSTABLE ELBOW,” now U.S. Pat. No. 10,456,547, which applicationis a national stage entry of International Application No.PCT/NZ2013/000138, filed Aug. 8, 2013, and titled “BREATHING TUBEASSEMBLIES WITH ADJUSTABLE ELBOW,” which application claims benefit ofU.S. Provisional Patent Application No. 61/681,083, filed Aug. 8, 2012,and titled “BREATHING TUBE ASSEMBLES WITH ADJUSTABLE ELBOW.” The entiredisclosure of each of the above items is hereby made part of thisspecification as if set forth fully herein and incorporated by referencefor all purposes, for all that it contains. Any and all applications forwhich a foreign or domestic priority claim is identified in theApplication Data Sheet as filed with the present application are herebyincorporated by reference and made a part of the present disclosure.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention generally relates to respiratory therapy systemsand breathing tube assemblies that can be used with respiratory therapysystems. In particular, the present invention relates to elbows forbreathing tube assemblies that permit adjustment of the breathing tubeassembly relative to an accompanying therapy device.

Description of the Related Art

Respiratory therapy systems and devices, including continuous positiveairway pressure (CPAP) systems and devices, flow therapy systems anddevices, and breathing tube assemblies for use with such devices arewell-known in the art. In addition, breathing tube assemblies thatpermit adjustment of a position of the breathing tube relative to therespiratory therapy device are known in the art. However, existingadjustable breathing tube assemblies are often complex to manufacture,which results in a high cost and, often, a shorter service life thannon-adjustable assemblies.

SUMMARY OF THE INVENTION

Accordingly, a need exists for respiratory therapy systems and breathingtube assemblies that address one or more shortcomings of the prior art.In particular, one or more embodiments of the invention provide foradjustment of the breathing tube assembly relative to the respiratorytherapy device in an assembly that can be manufactured in acost-effective manner and that provides a similar or increased servicelife relative to non-adjustable or prior art adjustable assemblies.

Respiratory therapy systems and breathing tube assemblies for use withrespiratory therapy systems, such as a CPAP system, of the preferredembodiments include an elbow that permits adjustment of a position ofthe breathing tube assembly relative to the respiratory therapy device.In some arrangements, the breathing tube assembly includes a breathingtube and a swivel elbow. The breathing tube is rotationally fixedrelative to the respiratory therapy device and the swivel elbowrotatable relative to the breathing tube. In other arrangements, thebreathing tube assembly includes an elbow that can be coupled to therespiratory therapy device in one of several possible positions.

A preferred embodiment involves a respiratory therapy system including aflow generator, a flexible breathing tube assembly, a patient interfaceand a swivel elbow. The flow generator generates a flow of a breathinggas and includes an outlet for the flow of the breathing gas. Theflexible breathing tube assembly includes a connector and a tube, whichhas a first end and a second end. The first end is coupled to theconnector in a substantially non-rotatable manner. The connector couplesthe breathing tube to the outlet of the flow generator. The patientinterface is coupled to the second end of the breathing tube such thatthe breathing tube can deliver the flow of the breathing gas from theflow generator to the patient interface. The swivel elbow is rotatablycoupled to the connector of the breathing tube. The swivel elbowincludes an engagement portion that at least partially surrounds thebreathing tube to couple the swivel elbow to the breathing tube. Theswivel elbow further includes a curved surface portion that guides afirst portion of the breathing tube into a curved shape. The breathingtube is rotatable relative to the engagement portion of the swivel elbowsuch that the swivel elbow can be rotated relative to the connector tovary a direction in the breathing tube extends relative to the flowgenerator.

In some arrangements, the swivel elbow has a greater resistance todeformation than the breathing tube such that, in use, the swivel elbowinhibits occlusion of the breathing tube as a result of being collapsedby external forces. The engagement portion can completely surround thebreathing tube. The engagement portion can only partially surround thebreathing tube thereby defining a slit in the engagement portion.

In some arrangements, the curved surface portion extends between aportion of the swivel elbow that is coupled to the connector and theengagement portion. The curved surface portion can subtend an angle ofapproximately 90 degrees in a length direction of the breathing tube.The curved surface portion can surround approximately one-half of thebreathing tube in a circumferential direction. The curved surfaceportion can be located on an inside portion or an outside portion of thecurved shape. The swivel elbow can also include a tab sized and shapedto facilitate grasping by a user. The tab can be located generallyopposite the curved surface portion or engagement portion. The swivelelbow can be constructed from a pair of interlocking halves.

In some arrangements, the connector includes a first interferencesurface portion and the flow generator includes a second interferencesurface portion that, when the breathing tube is coupled to the flowgenerator, engages the first interference surface portion to secure thebreathing tube to the flow generator. The second interference surfaceportion can be defined by the outlet of the flow generator and the firstinterference surface portion can be defined by a portion of theconnector that is received within the outlet. The second interferencesurface portion can be adjacent the outlet of the flow generator and thefirst interference surface portion can be defined by a portion of theconnector that is adjacent the outlet. The first interference surfaceportion can be defined by a tab of the connector that engages acorresponding recess of the flow generator. The second interferencesurface portion can be defined by at least one tab of the flowgenerator, which engages an external shoulder of the swivel elbow, whichdefines the first interference surface portion.

In some arrangements, the connector includes a first electrical terminalconfigured to connect to a second electrical terminal on the flowgenerator. The first and second electrical terminals can connect a heatsource of the flow generator to a heating coil of the breathing tube.The first and second electrical terminals can alternatively oradditionally provide for data communication between the breathing tubeand the flow generator.

An embodiment involves a breathing tube assembly, which includes aflexible breathing tube that can be coupled to a flow generator toreceive a flow of breathing gas from the flow generator and can becoupled to a patient interface to deliver the flow of the breathing gasto the patient interface. A swivel elbow engages a portion of thebreathing tube. The swivel elbow includes a curved surface portion thatguides the portion of the breathing tube into a curved shape. The swivelelbow is rotatable relative to the flow generator and is also rotatablerelative to the portion of the breathing tube such that the swivel elbowcan be rotated relative to the flow generator to vary a direction inwhich the breathing tube extends relative to the flow generator.

In some arrangements, the curved surface portion of the swivel elbowcontacts an external surface of the breathing tube. The curved surfaceportion can subtend an angle of approximately 90 degrees in a lengthdirection of the breathing tube. The curved surface portion can surroundapproximately one-half of the breathing tube in a circumferentialdirection. The curved surface portion can be located on an insideportion or an outside portion of the curved shape. The swivel elbow canalso include a tab sized and shaped to facilitate grasping by a user.The tab can be located generally opposite the curved surface portion ora portion of the swivel elbow that at least partially surrounds thebreathing tube. The swivel elbow can be constructed from a pair ofinterlocking halves.

In some arrangements, the connector includes a first interferencesurface portion and the flow generator comprises a second interferencesurface portion that, when the breathing tube is coupled to the flowgenerator, engages the first interference surface portion to secure thebreathing tube to the flow generator. The second interference surfaceportion can be defined by the outlet of the flow generator and the firstinterference surface portion can be defined by a portion of theconnector that is received within the outlet. The second interferencesurface portion can be adjacent the outlet of the flow generator and thefirst interference surface portion can be defined by a portion of theconnector that is adjacent the outlet. The first interference surfaceportion can be defined by a tab of the connector that engages acorresponding recess of the flow generator. The second interferencesurface portion can be defined by at least one tab of the flowgenerator, which engages an external shoulder of the swivel elbow, whichdefines the first interference surface portion.

In some arrangements, the connector includes a first electrical terminalconfigured to connect to a second electrical terminal on the flowgenerator. The first and second electrical terminals can connect a heatsource of the flow generator to a heating coil of the breathing tube.The first and second electrical terminals can alternatively oradditionally provide for data communication between the breathing tubeand the flow generator.

An embodiment involves a respiratory therapy system, including a flowgenerator, a flexible breathing tube assembly and a patient interface.The flow generator generates a flow of a breathing gas and includes anoutlet for the flow of the breathing gas. The flow generator alsoincludes a first electrical terminal and a second electrical terminal.The flexible breathing tube assembly includes a tube and a connector.The tube has a first end and a second end. The first end of the tube iscoupled to the connector. The connector couples the breathing tubeassembly to the outlet of the flow generator. The connector has a tubeelectrical terminal that is connectable to either of the firstelectrical terminal or the second electrical terminal of the flowgenerator. The patient interface is coupled to the second end of thetube such that the breathing tube assembly can deliver the flow of thebreathing gas from the flow generator to the patient interface. Thebreathing tube assembly can be connected to the flow generator in afirst position in which the tube electrical terminal is coupled to thefirst electrical terminal of the flow generator, and can be connected tothe flow generator in a second position in which the tube electricalterminal is coupled to the second electrical terminal of the flowgenerator.

In some arrangements, the outlet of the flow generator defines an outletaxis and the first end of the tube defines a tube axis, and theconnector orients the tube axis at an angle relative to the outlet axisin each of the first position and the second position. The angle can beapproximately 90 degrees. The tube can extend in a first direction whenthe breathing tube assembly is in the first position and can extend in asecond direction when the breathing tube assembly is in the secondposition, wherein the second position is opposite the first direction.

In some arrangements, the connector includes a first interferencesurface portion and the flow generator comprises a second interferencesurface portion that, when the breathing tube is coupled to the flowgenerator, engages the first interference surface portion to secure thebreathing tube to the flow generator. The second interference surfaceportion can be defined by the outlet of the flow generator and the firstinterference surface portion can be defined by a portion of theconnector that is received within the outlet. The first interferencesurface portion can be defined by a tab of the connector that engages acorresponding recess of the flow generator.

In some arrangements, the first and second electrical terminals and thetube electrical terminal connect a heat source of the flow generator toa heating coil of the breathing tube. The first and second electricalterminals and the tube electrical terminal can additionally oralternatively provide for data communication between the breathing tubeand the flow generator.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects and advantages of the breathing tubeassembly with elbow are disclosed herein with reference to drawings ofpreferred embodiments, which are provided for the purpose ofillustration and not limitation. The drawings contain thirty (30)figures.

FIG. 1 is a perspective view of a flow generator and a breathing tubeassembly, which includes a tube, a connector and a swivel elbow.

FIG. 2 is a perspective view of the breathing tube assembly of FIG. 1separated from the flow generator.

FIG. 3 is a perspective view of the breathing tube assembly of FIG. 2,with the swivel elbow separated from the tube and the connector.

FIG. 4 is a sectional view of the flow generator and breathing tubeassembly of FIG. 1 taken along the line 4-4 of FIG. 1.

FIG. 5 is a perspective view of a flow generator and an alternativebreathing tube assembly, which includes a tube, a connector and a swivelelbow.

FIG. 6 is a perspective view of the breathing tube assembly of FIG. 5separated from the flow generator.

FIG. 7 is a perspective view of the breathing tube assembly of FIG. 6,with the swivel elbow separated from the tube and the connector.

FIG. 8 is a sectional view of the flow generator and breathing tubeassembly of FIG. 5 taken along the line 8-8 of FIG. 5.

FIG. 9 is a perspective view of a flow generator and yet anotheralternative breathing tube assembly, which includes a tube, a connectorand a swivel elbow.

FIG. 10 is a perspective view of the breathing tube assembly of FIG. 9separated from the flow generator.

FIG. 11 is a perspective view of the breathing tube assembly of FIG. 10,with the swivel elbow separated from the tube and the connector.

FIG. 12 is a sectional view of the flow generator and breathing tubeassembly of FIG. 9 taken along the line 12-12 of FIG. 9.

FIG. 13 is a perspective view of an alternative swivel elbow, whichincludes relatively small slits extending in a lengthwise direction ateach end of the elbow.

FIG. 14 is a perspective view of yet another alternative swivel elbow,which includes larger slits relative to the swivel elbow of FIG. 13.

FIG. 15 is a perspective view of another alternative swivel elbow, whichomits one of the loop end portions of the prior swivel elbows.

FIG. 16 is a perspective view of a flow generator and an alternativebreathing tube assembly, which includes a tube and an elbow connector.The flow generator includes a first electrical terminal and a secondelectrical terminal. The breathing tube assembly includes a tubeelectrical terminal that connects to the first electrical terminal in afirst position of the breathing tube assembly and connects to the secondelectrical terminal in a second position of the breathing tube assembly.The elbow connector includes an interlocking arrangement to selectivelysecure the breathing tube assembly to the flow generator.

FIG. 17 is a perspective view of the breathing tube assembly of FIG. 16separated from the flow generator.

FIG. 18 is a sectional view of the flow generator and breathing tubeassembly of FIG. 16 taken along line 18-18 of FIG. 16.

FIG. 19 is a perspective view of a flow generator and an alternativebreathing tube assembly, relative to the assembly of FIGS. 16-18.

FIG. 20 is a perspective view of the breathing tube assembly of FIG. 19separated from the flow generator.

FIG. 21 is a sectional view of the flow generator and breathing tubeassembly of FIG. 19 taken along line 21-21 of FIG. 19.

FIG. 22 is a perspective view of a flow generator and anotheralternative breathing tube assembly, relative to the assemblies of FIGS.16-21.

FIG. 23 is a perspective view of the breathing tube assembly of FIG. 22separated from the flow generator.

FIG. 24 is a sectional view of the flow generator and breathing tubeassembly of FIG. 22 taken along line 24-24 of FIG. 22.

FIG. 25 is a perspective view of a flow generator and yet anotheralternative breathing tube assembly, relative to the assemblies of FIGS.16-24.

FIG. 26 is a perspective view of the breathing tube assembly of FIG. 25separated from the flow generator.

FIG. 27 is a sectional view of the flow generator and breathing tubeassembly of FIG. 25 taken along line 27-27 of FIG. 25.

FIG. 28 is a perspective view of a flow generator and an alternativebreathing tube assembly, which is similar to the breathing tubeassemblies of FIGS. 1-15. The breathing tube assembly of FIG. 28includes a tube, a connector and a swivel elbow.

FIG. 29 is a perspective view of an inside of the breathing tubeassembly of FIG. 28 separated from the flow generator.

FIG. 30 is a perspective view of an outside of the breathing tubeassembly of FIG. 28 separated from the flow generator.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The respiratory therapy systems, breathing tube assemblies and relatedcomponents are described herein in the context of a healthcarerespiratory device that provides a breathing gas at or above a minimumpressure or flow, which preferably is an elevated pressure relative tothe ambient pressure. In particular, the illustrated respiratory therapysystem is a continuous positive airway pressure (CPAP) device thatprovides a breathing gas (e.g., air) at or above a minimum pressure. Thepressure level can be fixed or variable. Examples of suitable CPAPdevices include the ICON™ Series or SleepStyle™ Series CPAP devices soldby Fisher & Paykel Healthcare. However, the disclosed systems, breathingtube assemblies and related components can also be utilized in othercontexts or applications, as well. For example, the systems, breathingtube assemblies and related components can be utilized in adult,pediatric or infant respiratory systems and surgical humidificationsystems, among others. Therefore, the use of the terms “humidifier,”“humidification device,” or “CPAP device” herein are intended to coverother types of flow generators (humidified or non-humidified), as well.

FIGS. 1-4 illustrate a respiratory therapy system 100, which preferablyprovides a flow of a breathing gas (e.g., air) at a positive pressure toa patient interface 102 to, among other uses, treat obstructive sleepapnea. The system 100 includes a flow generator 104, which, as describedabove, preferably is a CPAP device that generates a flow of humidifiedbreathing gas, such as air. The CPAP device 104 preferably includes aninternal water reservoir (not shown), a heating device that heats thewater in the water reservoir, and a blower or pump (not shown) thatgenerates a flow of air. The flow of air is passed through the waterreservoir to increase the humidity of the flow of air and the humidifiedflow of air is delivered to an outlet 106 (FIG. 4). In otherarrangements, the flow generator 104 could provide a flow ofnon-humidified breathing gas, which could be air or another suitablegas.

A conduit or breathing tube assembly 110 is coupled to the outlet 106 atone end and is coupled to the patient interface 102 at the other end todeliver the humidified flow of air to from the outlet 106 to the patientinterface 102. The patient interface 102 can be any suitable type ofinterface that can deliver the flow of air to the respiratory system ofthe patient. The illustrated patient interface 102 is a nasal mask,which covers the nose of a patient, but does not cover the patient'smouth. Other suitable patient interfaces include, for example andwithout limitation, full face masks, nasal cannula, endotracheal ortracheostomy interfaces.

The breathing tube assembly 110 preferably includes a tube portion ortube 112, a connector 114 and a swivel elbow 116. The tube 112 is aflexible tube to provide for freedom of movement of the patientinterface 102 relative to the CPAP device 104. That is, preferably, thetube 112 is capable of bending along its length without a significantamount of resistance so as to accommodate movement of a user of thesystem 100 within a range of motion of the breathing tube assembly 110.The tube 112 can be connectable to the patient interface 102 by anysuitable arrangement, such as an interlocking or friction-fitarrangement, for example and without limitation. Preferably, the tube112 includes an integrated electrical element or circuit 120, which canbe a heating circuit or heating coil, a data circuit, any other type ofelectrical element or circuit, or any combination thereof. In theillustrated tube 112, the electrical element 120 is a spiral-woundheating coil that is enclosed within a wall of the tube 112.

The connector 114 is coupled to the end of the tube 112 opposite thepatient interface 102 and permits the breathing tube assembly 110 to beconnected to the CPAP device 104. The connector 114 can be coupled tothe end of the tube 112 in any suitable manner to create an airtight orsubstantially airtight connection therebetween. The connector 114preferably is permanently coupled to the tube 112, but could also beremovable coupled to the tube 112, if desired. The connector 114 isconfigured to be received within the outlet 106 of the CPAP device 104.In particular, preferably, the connector 114 includes a flange portionor flange 122 and a shaft portion or shaft 124 that extends from theflange 122 in a direction opposite the tube 112. The shaft 124 is hollowand defines an internal passage 126 that communicates with the interiorpassage of the tube 112. In the illustrated arrangement, the shaft 124of the connector 114 is received within the outlet 106 of the CPAPdevice 104; however, in other arrangements, the connector 114 coulddefine a female portion of the connection and the outlet 106 coulddefine the male portion.

Preferably, the flange 122 abuts against an exterior surface of the CPAPdevice 104 when the breathing tube assembly 110 is assembled to the CPAPdevice 104. The flange 122 also carries an electrical terminal, whichengages a complementary electrical terminal of the CPAP device 104 topermit electrical signals or electrical energy to be transmitted betweenthe CPAP device 104 and the breathing tube assembly 110. In theillustrated arrangement, the electrical terminal of the connector 114 isa plug 130 and the electrical terminal of the CPAP device 104 is areceptacle or port 132 (FIG. 8). However, this arrangement could also bereversed, if desired. The plug 130 is electrically connected to theheating coil 120 and/or other electrical element of the breathing tubeassembly 110. The port 132 is electrically connected to the heatingcircuit and/or other electrical circuits of the CPAP device 104.Preferably, the heating circuit of the CPAP device 104 provideselectrical energy to the heating coil 120 of the breathing tube assembly110 so that the heating coil 120 can provide heat energy to the flow ofhumidified air passing through the breathing tube assembly 110. As isknown, such an arrangement can prevent or limit condensation within thebreathing tube assembly 110. In addition, or in the alternative, theplug 130 and port 132 could provide for other electrical signals, suchas data signals, to be communicated between the CPAP device 104 and thebreathing tube assembly 110. For example, a sensor at the patientinterface-end of the breathing tube assembly 110 could provide dataregarding one or more parameters of the flow of air (e.g., temperature,humidity level) for use by the control system of the CPAP machine. Anyother desirable electrical signals could also be transmitted.

Preferably, the connector 114 includes features to facilitate theinsertion of the connector 114 into and/or the retention of theconnector 114 within the outlet 106 of the CPAP device 104. For example,the shaft 124 of the connector 114 can include a guide rib 134, whichextends in a lengthwise direction of the shaft 124. The guide rib 134can engage with a complementary groove (not shown) of the outlet 106 toassist in the insertion of the connector 114 into the outlet 106 with aproper alignment of the plug 130 and port 132. In addition to, or in thealternative of, the guide rib 134, the plug 130 could be increased inlength relative to the illustrated arrangement of FIGS. 1-4. Forexample, the plug 130 could be between about ¾ of the length of theshaft 124 to about the same length or longer than the shaft 124. In suchan arrangement, the plug 130 would engage the port 132 sooner and assistin the proper alignment and insertion of the connector 114 into theoutlet 106. In the illustrated arrangement, the guide rib 134 is locatedopposite the plug 130.

The connector 114 preferably also includes a feature that facilitatesretention of the connector 114 to the CPAP device 104. In somearrangements, the feature is an interlocking arrangement between theconnector 114 and the CPAP device 104. In the illustrated arrangement,the shaft 124 includes a protrusion 136, which defines an interferenceor interlocking surface. The outlet 106 includes a complementary recess140, which also defines an interference or interlocking surface. Whenthe connector 114 is coupled to the CPAP device 104, the protrusion 136is received within the recess 140 and the interaction between theirrespective interference surfaces creates a retention force tending toinhibit undesired disconnection of the connector 114 from the CPAPdevice 104. In some arrangements, the location of the protrusion 136 andrecess 140 could be reversed. The illustrated protrusion 136 and recess138 are elongated and extend in a circumferential direction of the shaft124 and outlet 106, respectively. In addition, preferably, more than oneprotrusion/recess pair 136/140 is provided. In the illustratedarrangement, two pairs of corresponding protrusions 136 and recesses 140are provided and are equally spaced around the circumference of theshaft 124. Although a protrusion 136 and recess 140 arrangement arepreferred, other suitable types of interlocking or interferencearrangements could also be used.

Preferably, the breathing tube assembly 110 includes one or morefeatures that orients a portion of the breathing tube 112 into a bendand/or provides crush protection to a portion of the breathing tube 112.Preferably, the breathing tube 112 can also be moved relative to theCPAP device 104 such that the breathing tube 112 can be oriented in atleast two different positions and preferably to any position within arange of possible positions. In some arrangements, the portion of thebreathing tube 112 that is oriented into a bend and/or provided crushprotection is a portion of the tube 112 adjacent the connector 114. Insome cases, the outlet 106 is positioned on a rearward surface of theCPAP device 104 (e.g., relative to a user interface or otherwise-definedforward surface). Therefore, it is often desirable for the breathingtube 112 to bend at or near the connector 114/outlet 106 to reduce theamount of room necessary at the outlet-side (e.g., rearward surface) ofthe CPAP device 104 to accommodate the breathing tube 112. In addition,the rearward (or other) positioning of the outlet 106 can create a riskthat the CPAP device 104 is pushed toward a wall or other object untilthe breathing tube 112 is crushed against the wall or object, whichcould cause a partial or total occlusion of the breathing tube 112and/or cause damage to the breathing tube 112. Thus, it is oftendesirable to provide for some amount of protection to the breathing tube112 and especially a portion of the breathing tube 112 at or near theoutlet 106. The CPAP device 104 can also be located on either side ofthe patient/user. Therefore, it is often also desirable to permit thebreathing tube 112 to be adjustable (e.g., rotatable) relative to theCPAP device 104. In the illustrated arrangement, the swivel elbow 116provides each of the above-described features. That is, the illustratedswivel elbow 116 urges the tube 112 into a bend, provides crushprotection and permits the position of the tube 112 to be variedrelative to the CPAP device 104. However, in other arrangements, theswivel elbow 116 could provide less than all of these features. Forexample, the swivel elbow 116 could provide any one or combination ofthe above-described features.

Preferably, the swivel elbow 116 urges, guides, constrains or otherwisedirects a portion of the tube 112 into a bend or a curved orientation.Preferably, the curved portion of the tube 112 is near or adjacent theconnector 114. The illustrated swivel elbow 116 includes a first portionor connector engagement portion 142 that contacts, and preferablyengages, the connector 114. The swivel elbow 116 also includes a secondportion or tube engagement portion 144 that contacts, and preferablyengages, the tube 112. In the illustrated arrangement, the connectorengagement portion 142 and the tube engagement portion 144 are in theform of bands that substantially or entirely surround a circumference ofthe connector 114 and/or tube 112. In alternative arrangements, theswivel elbow 116 could instead be coupled to the CPAP device 104 whileretaining some or all of the functions described herein.

The swivel elbow 116 further includes a tube guide portion 146 thatextends between the connector engagement portion 142 and the tubeengagement portion 144. Preferably, the tube guide portion 146 defines acurved surface 150, which guides the tube 112 into a curved orientation.Accordingly, an axis of the connector engagement portion 142 is offsetat an angle relative to an axis of the tube engagement portion 144. Inthe illustrated arrangement, the angle is approximately 90 degrees.However, in other arrangements, the angle could be any angle within therange of between about 45 degrees and about 180 degrees. If desired, theangle could also be outside of this range. In some arrangements, theangle could be adjustable by, for example, providing a pivot in theswivel elbow 116. Preferably, at least a portion of the curved surface150 contacts the tube 112; however, the tube guide portion 146 couldalso be configured to simply interconnect the connector engagementportion 142 and the tube engagement portion 144, which could orient thetube 112 into a bend with little or no contact between the tube 112 andthe tube guide portion 146. In addition, although the connectorengagement portion 142, the tube engagement portion 144 and the tubeguide portion 146 are external of the tube 112, in alternativearrangements one or more of these structures could be internal to thetube 112.

Preferably, the swivel elbow 116 also provides at least some amount ofcrush protection to the tube 112. Therefore, preferably, the swivelelbow 116, or at least the tube guide portion 146, is constructed from amaterial that is more rigid than the tube 112 or has greater resistanceto bending relative to the tube 112. Relatively rigid plastic, metal orother materials can be used, although one preferred embodiment isconstructed from plastic. Preferably, the tube guide portion 146 canmaintain its shape in response to expected crushing forces in normal useof the system 100. The tube guide portion 146 can completely surround acircumference of the tube 112; however, in the illustrated arrangement,the tube guide portion 146 only partially surrounds the tube 112. Inparticular, the illustrated tube guide portion 146 surroundsapproximately or exactly half of the circumference of the tube 112.Preferably, the tube guide portion 146 is positioned on the outer sideof the tube 112 relative to the bend (e.g., the center point of the bendradius) such that the tube guide portion 146 is positioned to contact awall or other object instead of the tube 112, thereby reducing thelikelihood of partial or complete occlusion of the tube 112. Asdescribed above, the tube guide portion 146 could be internal orexternal of the tube 112.

Preferably, the swivel elbow 116 is rotatable about at least thelongitudinal axis of the outlet 106 of the CPAP device 104 to permit aposition of the tube 112 to be varied relative to the CPAP device 104.In the illustrated arrangement, the swivel elbow 116 can be rotated 360degrees about the axis of the outlet 106, and beyond. That is, theswivel elbow 116 can be rotated in a single direction for multiplerotations. However, in other arrangements, the rotation of the swivelelbow 116 may be limited, either as a result of the elbow 116 structureor as a result of interference with other components/objects. Forexample, rotation of the swivel elbow 116 can be less than 45 degrees,equal to or greater than 45 degrees, equal to or greater than 180degrees, or equal to or greater than 270 degrees, among otherpossibilities.

As described above, the swivel elbow 116 can be coupled to the connector114. In the illustrated arrangement, the connector engagement portion142 receives a boss 152 of the connector 114, which extends from theflange 122 in the opposite direction of the shaft 124. However, thisarrangement could be reversed and the connector engagement portion 142could be received within the boss 152, among other possible connectionarrangements. Preferably, an interlocking arrangement secures theconnector engagement portion 142 to the boss 152 in an axial direction,but permits rotation therebetween. The illustrated interlockingarrangement includes a circumferential protrusion 154 defined by one ofthe connector engagement portion 142 and the boss 152 and acomplementary circumferential groove 156 defined by the other of theconnector engagement portion 142 and the boss 152. In the illustratedarrangement, the protrusion 154 is defined by the boss 152 and thegroove 156 is defined by the connector engagement portion 142; however,this arrangement could be reversed. In addition, the illustratedprotrusion 154 is not continuous about the entire circumference of theboss 152. In particular, the illustrated protrusion 154 includes atleast a pair, and preferably exactly a pair, of protrusion portions 154equally spaced about the circumference of the boss 152. In addition,other types of interlocking arrangements can also be used.

Preferably, the swivel elbow 116 is not coupled to the tube 112 and doesnot tightly surround the tube 112 such that relative rotation betweenthe swivel elbow 116 and the tube 112 is permitted. Preferably, the tube112 is relatively loosely received within the swivel elbow 116 such thata gap exists or can exist upon centering of the tube 112 relative to theswivel elbow 116 to facilitate relative rotation therebetween. That is,the tube 112 preferably does not rotate relative to the outlet 106 ofthe CPAP device 104, but simply relies on the flexible nature of thetube 112 to change positions. In some arrangements, the gap between thetube 112 and the interior surface of the swivel elbow 116 can be withina range of about 0.05-0.1 millimeters. However, the gap could also beless than or greater than this ranges. Because the swivel elbow 116 iscapable of rotation relative to the connector 114, and the tube 112 canslide or rotate within the swivel elbow 116, adjustment of a position ofthe tube 112 relative to the CPAP device 104 is permitted, with theswivel elbow 116 being capable or directing the tube 112 in a desireddirection. Advantageously, such an arrangement provides for adjustmentof a position of the tube 112 relative to the CPAP device 104, whilemaintaining the electrical connection between the electrical terminals130, 132, with a relatively simple structure that is cost-effective tomanufacture and provides a long service life. In alternativearrangements, the swivel elbow 116 could provide for additional freedomof movement. For example, the swivel elbow 116 could be permitted torotate about one or more axes that are perpendicular or substantiallyperpendicular to the axis of the outlet 106, shaft 124 and/or boss 152(e.g., via a ball-and-socket joint).

In use, the CPAP device 104 can be set-up as normal, with the waterreservoir filled (if applicable), the device 104 plugged in and mode orparameters of operation set appropriately. If necessary, the swivelelbow 116 can be assembled to the tube 112 and connector 114. Forexample, the swivel elbow 116 can be slid from the patient interface-endof the tube 112 to the connector-end of the tube 112 and coupled to theconnector 114 via the interlocking arrangement. The patient interface102 can be coupled to the tube 112 and the breathing tube assembly 110can be coupled to the CPAP device 104 by coupling the connector 114 tothe outlet 106. The swivel elbow 116 can be rotated (directly orindirectly through movement of the tube 112) to orient the tube 112 andthe patient interface 102 in a desirable position relative to the CPAPdevice 104 (e.g., to the right, to the left, above or below), whilemaintaining connection between the electrical terminals 130, 132. TheCPAP device 104 can then be used in accordance with a desired protocol.

FIGS. 5-8 illustrate another respiratory therapy system 100, including abreathing tube assembly 110, which are similar to the system 100 ofFIGS. 1-4. Accordingly, the same reference numbers are used to indicatecorresponding or similar components and only differences between thesystems 100 will be described. Components, assemblies or features notspecifically described can be assumed to be the same as or similar tothe same component, assembly or feature of the system 100 of FIGS. 1-4.

In the system 100 of FIGS. 5-8, the connector 114 includes analternative interlocking arrangement for securing the connector 114 tothe CPAP device 104. In particular, in the illustrated interlockingarrangement, the flange 122 of the connector 114 includes a resilienttab 200 that engages a corresponding recess 202 of the CPAP device 104.Preferably, the tab 200 is located opposite the electrical plug 130;however, other positions are also possible. The tab 200 has a lengththat is about the same or somewhat longer than the length of the plug130. Preferably, the tab 200 is shorter than the guide rib 134 (ifpresent), which preferably is located halfway in between the tab 200 andthe plug 130.

The tab 200 preferably is generally U-shaped and has a free end 204 anda fixed end 206 that is coupled to the flange 122 or other portion ofthe connector 114. Preferably, the tab 200 is unitary with the connector114 and/or flange 122. The closed end of the U-shaped tab 200 preferablyextends away from the flange 122 in the same direction as the shaft 124.An interference surface is defined by a protrusion 136 located on a legof the U-shaped tab 200, which is the leg that defines the free end 204in the illustrated arrangement. However, the protrusion 136 could bepositioned on the other leg, or on both legs, in some arrangements. Thefree end 204 is movable such that the protrusion 134 can enter therecess 202 and then engage a corresponding interference surface definedby space, opening or recess 140 extending from the recess 202. In theillustrated arrangement, the interference surface is defined by theouter housing of the CPAP device 104 and the protrusion is receivedwithin a space behind the housing (interior of the CPAP device 104). Theresiliency of the U-shaped tab 200 maintains contact between theinterference surfaces until the free end 204 is moved to disengage theinterference surfaces and permit disconnection of the connector 114 fromthe outlet 106. Preferably, the flange 122 defines a pair of prongs 210that receive the tab 200 therebetween to provide protection to the tab200 and inhibit out-of-plane movement of the tab 200. In other respects,the system 100 and breathing tube assembly 110 of FIGS. 5-8 is similarin structure and operation to the system 100 and tube assembly 110 ofFIGS. 1-4.

FIGS. 9-12 illustrate another respiratory therapy system 100, includinga breathing tube assembly 110, which are similar to the systems 100 ofFIGS. 1-4 and 5-8. Accordingly, the same reference numbers are used toindicate corresponding or similar components and only differencesbetween the systems 100 will be described. Components, assemblies orfeatures not specifically described can be assumed to be the same as orsimilar to the same component, assembly or feature of the systems 100 ofFIG. 1-4 or 5-8.

In the system 100 of FIGS. 9-12, an alternative interlocking arrangementis provided for securing the connector 114 to the CPAP device 104. Inparticular, in the illustrated interlocking arrangement, the swivelelbow 116 includes an annular portion 220 that surrounds all or aportion of the flange 122 of the connector 114. A transition between theconnector engagement portion 142 and the annular portion 220 defines ashoulder 222 or interference surface. The CPAP device 104 includes atleast one and preferably a pair of resilient tabs 224 that engage theannular portion 220 of the swivel elbow 116 to fix the connector 114 andswivel elbow 116 to the CPAP device 104 in an axial direction, butpermit rotation between the swivel elbow 116 and the CPAP device 104.The connector 114 preferably is prevented from rotating relative to theCPAP device 104 by the plug 130 and/or other structures (e.g., guide rib134). The tabs 224 include hook portions 226 that define interferencesurfaces that contact the interference surface(s) of the swivel elbow116. In other respects, the system 100 and breathing tube assembly 110of FIGS. 9-12 is similar in structure and operation to the systems 100and tube assemblies 110 of FIG. 1-4 or 5-8.

FIGS. 13-15 illustrate swivel elbows 116 which are similar to the swivelelbows 116 of FIGS. 1-4, 5-8 and 9-12. Accordingly, the same referencenumbers are used to indicate corresponding or similar components andonly differences between the swivel elbows 116 will be described.Features not specifically described can be assumed to be the same as orsimilar to the same or corresponding feature of the swivel elbows 116 ofFIG. 1-4, 5-8 or 9-12.

The swivel elbow 116 of FIG. 13 includes slits 230 in at least one ofthe connector engagement portion 142 or the tube engagement portion 144,and preferably includes a slit 230 in each. As a result, the portions142 and/or 144 do not entirely surround a circumference of the connector114 or tube 112 when assembled. Preferably, the slits 230 extend in alengthwise direction entirely through the portions 142 and/or 144. Theportions 142, 144 can be flexible enough to permit the connector 114 ortube 112 to be passed through the slit 230 when the portion 142, 144 isflexed outwardly. However, preferably, the flex provided by the portions142, 144 is sufficient to simply ease assembly of the portion 142, 144to the connector 114 or tube 112.

The swivel elbow 116 of FIG. 14 includes slits 230 that are wider orcircumferentially longer than the slits 230 of the swivel elbow 116 ofFIG. 13. The slits 230 of FIG. 14 can extend about ¼ or more of acircumference of the portions 142 and/or 144. Preferably, the slits 230of the elbow 116 of FIG. 14 can permit the tube 112 or connector 114 topass through the slits 230.

The swivel elbow 116 of FIG. 15 includes a truncated tube engagementportion 144. That is, the tube engagement portion 144 does not extendaround the entire circumference of the tube 112 when assembled.Preferably, the tube engagement portion 144 is approximately coextensivein a circumferential direction with the tube guide portion 146. In somecases, this can be about one-half of the circumference of the tube 112.In other cases, this can be between about one-half and three-quarters ofthe circumference of the tube 112, or between about five-eighths andthree-quarters of the circumference of the tube 112.

Any of the above-described swivel elbows 116 can be constructed of asingle piece of material or multiple pieces of materials (the same ordifferent material) connected together in any suitable manner. Forexample, in some cases, the elbow 116 is constructed from two halves,separated in a lengthwise direction and which can be coupled together(e.g., a clamshell arrangement). This can permit easy assembly onto theconnector 114 and tube 112 without passing the entire tube 112 throughthe elbow 116.

FIGS. 16-27 illustrate alternative systems 100 including alternativeconnections between the breathing tube assembly 110 and the CPAP device104. Accordingly, the same reference numbers are used to indicatecorresponding or similar components and only differences between thesystems 100 of FIGS. 16-27 and the prior systems will be described.Features not specifically described can be assumed to be the same as orsimilar to the same or corresponding feature of the systems of FIGS.1-12.

In the systems of FIGS. 16-27, a fixed elbow connector 114 is providedto couple the tube 112 to the CPAP device 104. That is, in at least somearrangements, the elbow connectors 114 cannot rotate relative to theCPAP device 104 while remaining connected to the CPAP device 104.Instead, preferably, the elbow connectors 114 are configured to beconnectable to the CPAP device 104 in at least two separate orientationsor positions and provide electrical connection between the breathingtube assembly 110 and/or the patient interface 102 and the CPAP device104 in each of the separate positions. In the illustrated arrangements,the CPAP device 104 includes two electrical terminals 132 a and 132 b,which may be in the form of electrical ports or receptacles. Theconnectors 114 include a single electrical terminal 130, which may be inthe form of a plug and which can be connected to either of theelectrical terminals 132 a, 132 b of the CPAP device 104. In otherarrangements, these structures could be reversed and the ports could beprovided on the connector 114 and the plug on the CPAP device 104. Thearrangements of FIGS. 16-27 advantageously permits the breathing tubeassembly 110 to be coupled to the CPAP device 104 in at least twopositions that can selected based on the position of the user or patientrelative to the CPAP device 104, while providing electrical connectionin either position. In the illustrated arrangement, the positions aresubstantially opposite one another (i.e., tube 112 extending to the leftand tube 112 extending to the right). In other arrangements, thesepositions can be varied to remain opposite one another (e.g., up anddown) or to provide two options that are not opposite one another (e.g.,horizontal and vertical). In addition, more than two options could beprovided (e.g., left, right, up and down). In the illustratedarrangements, the connector 114 defines an angle of approximately orsubstantially 90 degrees between an axis of the breathing tube 112(e.g., at the end coupled to the connector 114) and an axis of theoutlet 106 of the CPAP device 104 to provide a relatively compactarrangement. However, in other arrangements, this angle could vary. Thealternative connectors 114 of FIGS. 16-27 differ from one anotherprimarily in the method of interconnecting the connector 114 with theCPAP device. Therefore, only the different interconnecting structuresare described in detail below.

In the arrangement of FIGS. 16-18, the connector 114 includes at leastone, and preferably a pair, of resilient portions or resilient arms 250that are movable relative to a main body 252 of the connector 114. Eacharm 250 includes a fixed end 254 connected to the main body 252 and amovable end, which can be a free end 256 that is movable toward and awayfrom the main body 252. The arms 250 are disposed on opposite sides ofthe main body 252. In the illustrated arrangement, the arms 250 areunitarily formed with the main body 252; however, in other arrangementsthe arms 250 could be separate members from the main body 252.Preferably, the arms 250 extend in a direction corresponding to an axisof the outlet 106 from the fixed end 254 to the free end 256 of the arms250 and have a length that is equal to or greater than about one-halfthe length of the main body 252 of the connector 114.

The fixed end 254 of each arm 250 is in the form of a pair ofspaced-apart connecting portions 260, which may provide a majority orall of the flexibility of the arms 250. The free end 256 of the arms 250preferably includes a tab 262 that is configured to selectively engage acorresponding recess or opening 264 of the CPAP device 104 to secure theconnector 114 (and breathing tube 112) to the CPAP device 104. The tab262 and recess or opening 264 define cooperating interference surfacesthat contact one another when the tab 262 is present in the recess oropening 264 to inhibit or prevent removal of the connector 114 from theCPAP device 104. In other arrangements, the location of the tab 262 andrecess or opening 264 can be reversed, or other suitable interlockingstructures can be provided. Preferably, the arms 250 also define fingergrip portions 266, which may include ridges or other grip-enhancingfeatures, that can be used to squeeze the arms 250 toward the main body252 and toward one another (assuming a pair of arms 250) to release thetab 262 from the recess or opening 264.

The connector 114 of FIGS. 19-21 includes a single resilient arm 250that extends along one side of the main body 252 of the connector 114.Preferably, the arm 250 extends along the opposite side of the main body252 relative to the tube 112. In the illustrated arrangement, the fixedend 254 of the arm 250 originates at or near the rearward end of themain body 252 and has a length that is at least about one-half of alength of the main body 252. Preferably, the arm 250 is relativelyslender in width with the exception of the finger grip portion 266,which is wider than the remainder of the arm 250, can be circular orgenerally circular in shape and can be located at approximately amid-point between the fixed end 254 and the tab 262 located at the freeend 256.

The connector 114 of FIGS. 22-24 includes at least one, and preferably apair, of resilient arms 250 on opposing sides of the main body 252.Preferably, the arms 250 are positioned within recessed central portions270 such that the arms 250 are generally or substantially flush, orrecessed within, surrounding portions of the main body 252. The fixedends 254 are located closer the open end of the connector 114 relativeto the free ends 256, which are located toward the rearward end of themain body 252. The tab 262 of each arm 250 is located between the fixedend 254 and the free end 256. Preferably, the finger grip portion 266 islocated at or near the free end 256 of the arm 250. It is noted that the“free” ends 256 of the arms 250 in this connector 114 are not completelydisconnected from the main body 252. Rather, the free ends 256 areconnected to the main body 252 by a reduced-wall thickness portion 272(FIG. 24) that permits movement of the free ends 256. In the illustratedarrangement, the reduced-wall thickness portion 272 also extends alongthe sides of the arms 250. Therefore, the term “free end” as used hereinapplies to movable ends of a flexible arm, which can be completelydisconnected from a surrounding structure or can be arranged to permitenough movement of the “free end” relative to the surrounding structureto accomplish the designated task of the flexible arm (e.g.,disconnection of the tab 262 from the recess or opening 264). Inaddition, the flexible arm need only be movable relative to surroundingstructure such that the designated task can be accomplished.

The connector 114 of FIGS. 25-27 includes a resilient portion 280 thatoperates in a manner similar to the resilient arms 250 of the connector114 of FIGS. 22-24. In the connector 114 of FIGS. 25-27, the resilientportion 280 carries the tab 262 and is movable relative to the main body252 of the connector 114. In particular, the resilient portion 280 ispartially or completely bounded by a reduced-wall thickness portion 272,which permits limited movement of the resilient portion 280, whichpreferably is enough movement to allow disengagement of the tab 262 fromthe recess or opening 264. The resilient portion 280 can becentrally-located within the main body 252 of the connector 114 suchthat the resilient portion 280 is completely surrounded by the main body252. Preferably, two resilient portions 280 are provided on oppositesides (e.g., top and bottom) of the main body 252 of the connector 114.

FIGS. 28-30 illustrate another respiratory therapy system 100, includinga flow generator 104 (e.g., CPAP device) and a breathing tube assembly110. The system 100 of FIGS. 28-30 is similar to the systems 100 ofFIGS. 1-15 and, therefore, the same reference numbers are used toindicate corresponding or similar components and only significantdifferences relative to the previously-described systems 100 aredescribed in detail. Any components, assemblies or features notdescribed in detail can be assumed to be identical or similar to thecorresponding component, assembly or feature of any of the previoussystems 100, or can be of any other suitable arrangement. Moreover, thesystem 100 can include any of the optional features (e.g., tab 200) ofthe systems 100 of FIGS. 1-15 that are not shown or described in theillustrated embodiment of FIGS. 28-30.

As in the prior systems 100 of FIGS. 1-15, the illustrated swivel elbow116 urges, guides, constrains or otherwise directs a portion of the tube112 into a bend, provides crush protection and permits the position ofthe tube 112 to be varied relative to the CPAP device 104. Preferably,the curved portion of the tube 112 is near or adjacent the connector114. The connector engagement portion 142 of the illustrated swivelelbow 116 engages the connector 114 and the tube engagement portion 144of the swivel elbow 116 engages the tube 112. In the illustratedarrangement, the connector engagement portion 142 and the tubeengagement portion 144 are in the form of bands that substantially orentirely surround a circumference of the connector 114 and/or tube 112.

The tube guide portion 146 extends between the connector engagementportion 142 and the tube engagement portion 144. Preferably, the tubeguide portion 146 defines a curved surface 150, which guides the tube112 into a curved orientation. As described previously, the angularoffset between the axis of the connector engagement portion 142 and theaxis of the tube engagement portion 144 can be approximately 90 degreesor any of the angles previously described with respect to the elbows 116of FIGS. 1-15.

In the illustrated arrangement, similar to the elbows 116 illustrated inFIGS. 1-15, the tube guide portion 146 only partially surrounds the tube112. In particular, the illustrated tube guide portion 146 surroundsapproximately or exactly half of the circumference of the tube 112.Preferably, unlike the elbows 116 of FIGS. 1-15, the tube guide portion146 of FIGS. 28-30 is positioned at least partially on the inside of thetube 112 relative to the bend (e.g., the center point of the bendradius) such that the tube guide portion 146 is positioned to support atleast a portion of the inside bend surface of the tube 112. Such anarrangement provides advantageous support and crush protection to thetube 112 and permits rotational adjustment of the tube 112 relative tothe CPAP device 104, while facilitating easier manufacture of the elbow116. Preferably, the tube guide portion 146 extends in a circumferentialdirection (relative to the tube 112) over the entire inside half of thetube 112. The illustrated tube guide portion 146 has a solid wallbetween its opposing (upper and lower) edges; however, the guide portion146 could include one or more openings or windows therein (or beconstructed from one or more axial portions) to reduce material oradjust the flexibility of the tube. As described above, although thetube guide portion 146 is illustrated as external to the tube 112, itcould be internal in other arrangements.

As described above, preferably, the swivel elbow 116 is rotatable aboutat least the longitudinal axis of the outlet 106 of the CPAP device 104to permit a position of the tube 112 to be varied relative to the CPAPdevice 104. In the illustrated arrangement, the swivel elbow 116 can berotated 360 degrees about the axis of the outlet 106, and beyond. Thatis, the swivel elbow 116 can be rotated in a single direction formultiple rotations. However, in other arrangements, the rotation of theswivel elbow 116 may be limited, as described above.

The swivel elbow 116 of FIGS. 28-30 preferably also includes a featureor features that facilitate assembly and/or disassembly of the breathingtube assembly 110 to or from the CPAP device 104. For example, theillustrated swivel elbow 116 includes a tab 290 of a suitable size andshape to permit a user to grasp the tab 290 to facilitate assembly ofthe breathing tube assembly 110 to the CPAP device 104 or to facilitateremoval of the breathing tube assembly 110 from the CPAP device 104.Preferably, the tab 290 is located on or near the connector engagementportion 142 of the swivel elbow 116 or is otherwise oriented generallyperpendicular to a longitudinal axis of a connection portion of thebreathing tube assembly 110 that is adjacent the outlet 106 of the CPAPdevice 104. Preferably, the tab 290 is oriented generallyperpendicularly relative to the axis of the outlet 106 and/or an outersurface of the CPAP device 104 surrounding or adjacent to the outlet106.

In the illustrated arrangement, the tab 290 is positioned on the outsideof the swivel elbow 116 (the outside of the bend) and/or on the side ofthe elbow 116 opposite the tube engagement portion 144. Advantageously,with such an arrangement, a user can grasp both the tab 290 and the tubeengagement portion 144 of the swivel elbow 166 to apply an even orbalanced force to the tube assembly 110 that is substantially alignedwith the axis of the connector 114 and/or the outlet 106 to facilitateassembly or disassembly of the breathing tube assembly 110 to or fromthe CPAP device 104. Manufacture and assembly of the breathing tube 110,assembly of the tube 110 to the CPAP (or other) device 104 and operationof the system 100 preferably is substantially similar or identical tothat described above with reference to FIGS. 1-15.

Unless the context clearly requires otherwise, throughout thedescription and the claims, the words “comprise”, “comprising”, and thelike, are to be construed in an inclusive sense as opposed to anexclusive or exhaustive sense, that is to say, in the sense of“including, but not limited to”.

Reference to any prior art in this specification is not, and should notbe taken as, an acknowledgement or any form of suggestion that thatprior art forms part of the common general knowledge in the field ofendeavour in any country in the world.

The invention may also be said broadly to consist in the parts, elementsand features referred to or indicated in the specification of theapplication, individually or collectively, in any or all combinations oftwo or more of said parts, elements or features.

Where, in the foregoing description reference has been made to integersor components having known equivalents thereof, those integers areherein incorporated as if individually set forth.

It should be noted that various changes and modifications to thepresently preferred embodiments described herein will be apparent tothose skilled in the art. Such changes and modifications may be madewithout departing from the spirit and scope of the invention and withoutdiminishing its attendant advantages. It is therefore intended that suchchanges and modifications be included within the scope of the invention.

What is claimed is:
 1. A breathing tube assembly comprising: a breathingtube, and a connector coupled to the breathing tube arranged tonon-rotatably connect the breathing tube to an outlet of a flowgenerator, a swivel elbow rotatably coupled to the connector, the swivelelbow comprising: a connector engagement portion including a connectorband that engages a circumference of the connector, a tube engagementportion including a tube band that engages a circumference of thebreathing tube, and a tube guide portion that extends between theconnector engagement portion and the tube engagement portion; whereinthe breathing tube comprises a first end that is coupled to theconnector in a non-rotatable manner; and wherein the swivel elbow isrotatable relative to the connector and is also rotatable relative tothe breathing tube such that the swivel elbow can be rotated relative tothe flow generator to vary a direction in which the breathing tubeextends relative to the flow generator.
 2. The breathing tube assemblyof claim 1, wherein the breathing tube has a second end that isconfigured to be attached to a patient interface.
 3. The breathing tubeassembly of claim 1, wherein the connector band surrounds an entirecircumference of the connector.
 4. The breathing tube assembly of claim1, wherein the connector band includes a connector band slit, such thatthe connector band does not entirely surround the circumference of theconnector.
 5. The breathing tube assembly of claim 1, wherein the tubeband surrounds an entire circumference of the breathing tube.
 6. Thebreathing tube assembly of claim 1, wherein the tube band includes atube band slit, such that the tube band does not entirely surround thecircumference of the tube.
 7. The breathing tube assembly of claim 1,wherein the tube guide portion defines a curved surface arranged toguide the tube into a curved orientation such that the tube has aninside curved surface and an outside curved surface.
 8. The breathingtube assembly of claim 1, wherein an axis of the connector engagementportion is offset at an angle relative to an axis of the tube engagementportion.
 9. The breathing tube assembly of claim 8, wherein the angle is90 degrees.
 10. The breathing tube assembly of claim 8, wherein theangle is within a range of between 45 degrees to 180 degrees.
 11. Thebreathing tube assembly of claim 8, wherein the angle is adjustable. 12.The breathing tube assembly of claim 1, wherein at least the tube guideportion of the swivel elbow has greater resistance to bending relativeto the tube.
 13. The breathing tube assembly of claim 1, wherein thetube guide portion at least partially surrounds a circumference of thebreathing tube.
 14. The breathing tube assembly of claim 1, wherein thetube guide portion surrounds half of the circumference of the breathingtube.
 15. The breathing tube assembly of claim 1, wherein the tube guideportion is configured to shield the tube by contacting a wall or otherobject instead of the breathing tube contacting the wall or otherobject, thereby reducing the likelihood of partial or complete occlusionof the tube.
 16. The breathing tube assembly of claim 1, wherein thetube guide portion is positioned at least partially adjacent an insidecurved surface of the breathing tube such that the tube guide portion ispositioned to support at least a portion of the inside curved surface ofthe breathing tube.
 17. The breathing tube assembly of claim 1, whereinthe tube guide portion includes one or more openings or windows therein.18. The breathing tube assembly of claim 1, wherein the connectorincludes: a flange, and a shaft extending from the flange, the shaftdefining a connector internal passage that communicates with an interiorpassage of the breathing tube.
 19. The breathing tube assembly of claim18, wherein the connector includes an electrical terminal extending fromthe flange, and wherein the electrical terminal is connected to anelectrical circuit that is integrated into the breathing tube.
 20. Thebreathing tube assembly of claim 1, wherein the swivel elbow includes atab positioned on an outside of a curve of the swivel elbow.
 21. Thebreathing tube assembly of claim 1, wherein the connector is permanentlycoupled to the breathing tube.
 22. A respiratory therapy system forproviding respiratory therapy to a user comprising: a flow generatorthat generates a flow of a breathing gas, the breathing tube assembly ofclaim 1, wherein the breathing tube assembly is arranged to deliver theflow of breathable gas to a patient interface.